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Implementation details for EF Core SaveChanges and the update pipeline. Use when changing CommandBatchPreparer, UpdateSqlGenerator, ModificationCommand, or related classes.
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Implementation details for EF Core test infrastructure. Use when changing test fixtures, SQL baseline assertions, test helpers, the test class hierarchy, or when adding new tests.
Implementation details for the EF Core Azure Cosmos DB provider. Use when changing Cosmos-specific code.
Run ApiChief in the EF Core repo to emit baselines, summaries, deltas, review files, or breaking-change checks. Use when refreshing `*.baseline.json`, preparing API review artifacts, or validating API changes.
Create custom GitHub Copilot agents. Use when asked to create, scaffold, or configure a custom agent, declarative agent, or @-invokable chat participant for GitHub Copilot.
Create new Agent Skills for GitHub Copilot. Use when asked to create, scaffold, or add a skill. Generates SKILL.md with frontmatter, directory structure, and optional resources.
Implementation details for EF Core migrations. Use when changing MigrationsSqlGenerator, model diffing, migration operations, HistoryRepository, the Migrator or related classes.
| name | update-pipeline |
| description | Implementation details for EF Core SaveChanges and the update pipeline. Use when changing CommandBatchPreparer, UpdateSqlGenerator, ModificationCommand, or related classes. |
| user-invocable | false |
Converts tracked entity changes into database INSERT/UPDATE/DELETE commands during SaveChanges().
SaveChanges() → DetectChanges() → IDatabase.SaveChanges()
→ UpdateAdapter creates IUpdateEntry list
→ CommandBatchPreparer.BatchCommands()
→ ModificationCommand per table row, composed of ColumnModification per column
→ SharedTableEntryMap is used to track entries mapped to the same row
→ Topological sort via Multigraph (FK dependency ordering)
→ Groups into ModificationCommandBatch (respects max batch size)
→ UpdateSqlGenerator generates SQL per batch
→ BatchExecutor executes all batches in a transaction
→ StateManager.AcceptAllChanges()
Concurrency tokens → WHERE conditions on UPDATE/DELETE. AffectedCountModificationCommandBatch checks affected rows. Throws DbUpdateConcurrencyException on mismatch.
SaveChanges() returns expected affected row countDbUpdateConcurrencyException thrown when expected for stale data